... orifice, rotor-stator cavity, and labyrinth seals. The component modeling results are validated by comparing literature test data, company owned test data, and Computational Fluid Dynamics (CFD) analysis. Discharge coefficients for orifices, swirl ratio for rotating cavities and leakage values for smooth...

... for both the stiffness and damping for the expander wheel and labyrinth seal, including the aerodynamic cross-coupling forces or cross-coupled stiffness coefficients that impact rotordynamic stability. A static eccentric method was applied where a transient simulation where the rotor portion is displaced...

... Abstract This paper presents the flow physics of condensing steam flow across a straight through labyrinth seal from numerical simulations performed using ANSYS CFX. Homogeneous nucleation model and droplet growth model, which are critical in predicting condensation, are validated with good...

... Abstract In recent years, multiphase pumps have become more and more popular because of the capability to simplify the process, reduce the footprint, and lower the cost. To compensate for the axial thrust force, an annular seal is normally used as a balance piston seal, and the labyrinth seal...

.... The outcome was satisfactory both in terms of leakage and rotordynamic coefficients. hybrid seal balance piston seal honeycomb seal labyrinth seal Proceedings of ASME Turbo Expo 2021 Turbomachinery Technical Conference and Exposition GT2021 June 7-11, 2021, Virtual, Online GT2021-59371 A NOVEL...

... Abstract Labyrinth seals are used in the clearance between rotor and stator such as steam turbines and centrifugal compressors in order to suppress loss of leakage. The leakage flow is induced in labyrinth seal by pressure difference between the inlet and outlet of the seal. This leakage flow...

... a process to engineer a SB upstream of a sixteen-tooth labyrinth seal (LS) with tip clearance C r = 0.203 mm. The process begins with a known nominal SB * geometry and considers variations in vane length ( L V * = 3.25 mm) and width ( W V * = 1.02 mm), and stagger angle ( θ * = 0°). The vane...

... paramount to quantify the leakage and dynamic force coefficients of annular seals operating with two-phase flow, a liquid in gas mixture or wet gas. Until now, a simple model for labyrinth seals (LSs) and the more modern pocket damper seals (PDSs) is not available, though these seal types find wide...

... that for instability case positive aerodynamic work region lies inside the oil collector cavern downstream labyrinth seal where pressure wave and surface displacement speed wave are close to synchrony. Probable excitation mechanisms were described and discussed. It was demonstrated that aeroelastic instability...

... Abstract Destabilization forces in labyrinth seals can cause subsynchronous vibration and many researchers have investigated the destabilization force under full admission (FA). It is known that partial admission (PA) can increase rotor instability, but there is little knowledge about seal...

... Abstract The labyrinth seal is one of the most popular non-contact annular seals used in centrifugal compressors to improve machine efficiency by reducing the secondary flow leakage. Reducing the radial clearance C r can effectively decrease the seal’s leakage and therefore increase...

... Abstract With the increasing demand of the oil & gas industry, many pump companies are developing multiphase pumps, which can handle liquid-gas flow directly without separating the liquid from a mixed flow. The see-through labyrinth seal is one of the popular types of non-contact annular...

...: Rotordynamics, micro-turbomachinery, oil- free, foil bearing, centrifugal compressor, expander / expansion turbine / turbo-expander, hole-pattern seal, labyrinth seal, stability analysis, seal taper sensitivity analysis 1 INTRODUCTION 1.1 Background The hydrocarbon recovery in some oil fields is limited due...

... of the machine at the maximum speeds required by the aerodynamic performance test matrix (110% of the designed operating speed). Various rotordynamic analyses investigated the effects of hole-pattern and labyrinth seals on stability, including a hole-pattern seal taper sensitivity study and the effect of higher...

... 11 01 2011 As labyrinth seals with honeycomb facings become more usual, the present paper reveals part of the honeycomb parameters which have an influence on the temperature drop across the seal and the temperature distribution along the rotor and the stator. Numerical and first...

... 04 08 2009 Design improvements on labyrinth seal teeth and a honeycomb land are examined by three-dimensional CFD numerical modeling of the flow field. The only objective is reduction of the total leakage through the new seal. CFD assumptions and analysis was validated by comparison...

... published experimental data and computational results. An example of implementation in an engine model is also presented. secondary air system orifice discharge coefficient rotating cavity pre-swirl system labyrinth seal performance Proceedings of ASME Turbo Expo 2008: Power for Land, Sea...

... impact on the dynamic stability of turbomachines. brush seal labyrinth seal swirl steam turbine CFD porosity modeling Proceedings of ASME Turbo Expo 2008: Power for Land, Sea and Air GT2008 June 9-13, 2008, Berlin, Germany GT2008-50257 1 Copyright © 2008 by ASME the efficiency of both...

... 11 09 2008 The objective of this study was to develop a Computational Fluid Dynamics (CFD) based methodology to obtain the flow characteristics of worn and unworn labyrinth seals which will be applicable over a wide range of seal geometries. In this paper, we present a process...